This may be a stupid thing to say but when the oil is new must be very slippery stuff for the engine can pull a stressfull load under low revs and the auto gearbox wont kick down. Now that I havent changed the oil in awhile the gearbox kicks down more. Thats one thing ive noticed.
Now I only use Shell Helix Ultra 5W 40, as its fully synthetic. Shell Helix Plus etc isnt.
The car is a 2002 Toyota Camry with the 1MZ-FE V6 engine. Very smooth.
I wont be able to give you say an x-ray analysis to tell you about the level of proctection judging by metal particles.
When I first used it my fuel consumption dropped and the engine and gearbox seemed alot more fluent.
I service it every 7500km's, its due for one soon. Oil is medium brown at the moment, of course it was a lovely clear gold before.
Um I hope this is what you were after, if not just let me know what you want me to comment on and ill be happy to.
Overall, i love this oil. Would only trust Mobil 1 and Castrol.